content: // Protocol Buffers - Google's data interchange format
  // Copyright 2008 Google Inc.  All rights reserved.
  // https://developers.google.com/protocol-buffers/
  //
  // Redistribution and use in source and binary forms, with or without
  // modification, are permitted provided that the following conditions are
  // met:
  //
  //     * Redistributions of source code must retain the above copyright
  // notice, this list of conditions and the following disclaimer.
  //     * Redistributions in binary form must reproduce the above
  // copyright notice, this list of conditions and the following disclaimer
  // in the documentation and/or other materials provided with the
  // distribution.
  //     * Neither the name of Google Inc. nor the names of its
  // contributors may be used to endorse or promote products derived from
  // this software without specific prior written permission.
  //
  // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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  // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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  // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  
  package com.google.protobuf;
  
  import protobuf_unittest.UnittestProto.TestAllExtensions;
  import protobuf_unittest.UnittestProto.TestAllTypes;
  import junit.framework.TestCase;
  
  /**
   * Unit test for {@link LazyField}.
   *
   * @author xiangl@google.com (Xiang Li)
   */
  public class LazyFieldTest extends TestCase {
    public void testHashCode() {
      MessageLite message = TestUtil.getAllSet();
      LazyField lazyField =
          createLazyFieldFromMessage(message);
      assertEquals(message.hashCode(), lazyField.hashCode());
      lazyField.getValue();
      assertEquals(message.hashCode(), lazyField.hashCode());
      changeValue(lazyField);
      // make sure two messages have different hash code
      assertNotEqual(message.hashCode(), lazyField.hashCode());
    }
  
    public void testHashCodeEx() throws Exception {
      TestAllExtensions message = TestUtil.getAllExtensionsSet();
      LazyField lazyField = createLazyFieldFromMessage(message);
      assertEquals(message.hashCode(), lazyField.hashCode());
      lazyField.getValue();
      assertEquals(message.hashCode(), lazyField.hashCode());
      changeValue(lazyField);
      // make sure two messages have different hash code
      assertNotEqual(message.hashCode(), lazyField.hashCode());
    }
  
    public void testGetValue() {
      MessageLite message = TestUtil.getAllSet();
      LazyField lazyField = createLazyFieldFromMessage(message);
      assertEquals(message, lazyField.getValue());
      changeValue(lazyField);
      assertNotEqual(message, lazyField.getValue());
    }
  
    public void testGetValueEx() throws Exception {
      TestAllExtensions message = TestUtil.getAllExtensionsSet();
      LazyField lazyField = createLazyFieldFromMessage(message);
      assertEquals(message, lazyField.getValue());
      changeValue(lazyField);
      assertNotEqual(message, lazyField.getValue());
    }
  
    public void testEqualsObject() {
      MessageLite message = TestUtil.getAllSet();
      LazyField lazyField = createLazyFieldFromMessage(message);
      assertTrue(lazyField.equals(message));
      changeValue(lazyField);
      assertFalse(lazyField.equals(message));
      assertFalse(message.equals(lazyField.getValue()));
    }
  
    @SuppressWarnings("EqualsIncompatibleType") // LazyField.equals() is not symmetric
    public void testEqualsObjectEx() throws Exception {
      TestAllExtensions message = TestUtil.getAllExtensionsSet();
      LazyField lazyField = createLazyFieldFromMessage(message);
      assertTrue(lazyField.equals(message));
      changeValue(lazyField);
      assertFalse(lazyField.equals(message));
      assertFalse(message.equals(lazyField.getValue()));
    }
  
    // Help methods.
  
    private LazyField createLazyFieldFromMessage(MessageLite message) {
      ByteString bytes = message.toByteString();
      return new LazyField(message.getDefaultInstanceForType(),
          TestUtil.getExtensionRegistry(), bytes);
    }
  
    private void changeValue(LazyField lazyField) {
      TestAllTypes.Builder builder = TestUtil.getAllSet().toBuilder();
      builder.addRepeatedBool(true);
      MessageLite newMessage = builder.build();
      lazyField.setValue(newMessage);
    }
  
    private void assertNotEqual(Object unexpected, Object actual) {
      assertFalse(unexpected == actual
          || (unexpected != null && unexpected.equals(actual)));
    }
  }
  